BD Vacutainer Safety-Lok Blood Collection Sets are single-use, double-ended, medical grade stainless steel needles. They have a threaded hub that fits into the threads of all BD Vacutainer Holders. The venipuncture end of the needle has a point specially designed to enter the skin easily during venipuncture and the needle is lubricated with silicone. Needles are available in 3/4 inch lengths in 21, 23 and 25 gauge, with 7” or 12” tubing. Needle size and lot number are printed on each individual package.